Pump-valve assembly



Dea25, 1928.

F. J. HEIDEMAN PUMP VALVE AS SEMBLY Filed Oct. 4, 1926 avwentoz Patented Dec. 25, 1928.

UNITED STATES PATENT OFFICE.

FRED J'. HEIDEMAN, OF DETROIT, MICHIGAN, ASSIGNOR T0 THOMAS C. WHITEHEAD,

' OF DETROIT, MICHIGAN.

PUMP-VALVE ASSEMBLY.

Application filed October 4, 1926. Serial No. 139,431.

This invention relates generally to pump assemblies and refers more particularly to those designed for use in refrigerating apparatus.

One of the essential objects of this invention is to obtain a double cushioning effect upon the return of the valve to its seat, thus preventing an abrupt seating of the valve and. thereby eliminating noise.

With these and other objects in view this invention resides in certain novel features of construction, combinations and arrangements of parts as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a top plan view of a pump assembly.

' Figure 2 is a section taken upon lines 22 of Figure 1.

Figure 3 is a view of the valve supporting plate and Figure 4 1s a. detail view of the valve. Referring now to the drawings, 1 15 a pump cylinder-which is adapted to compress gas, 2 is a plate having a series of openings 3 arranged in a circle and constituting outlet ports for the cylinder and 4 is a detachable head having a central exhaust passage 5 for the compressed gases. As shown the plate 2 has an annular recess 6 in its upper face and is preferably provided between the openings 3 and the upstanding walls 7 of the recess with a rounded ridge or head 8 that serves as a hearing or seat for an upper metal wafer valve 9. Preferably the base 10 of the recess 6 is flat and is lower than the ridge'8 which surrounds the openings 3.

Located directly beneath the upper valve 9 and designed to rest upon the base 10 is a lower metal wafer valve 11. To provide an efficient construction the valves 9 and 11 are preferably formed from light gauge sheet metal, the wafer 9 being substantially equal in area to the area of the recess 6. The lower wafer 11 is preferably of smaller diameter than the upper wafer 9 and has its peripheral edges curved downwardly as at 12 so that they normally engage the inside portions of the ridge or bead 8 and at the same time cover the openings 3.

Normally the central portions of the valves are yieldably held upon the flat base 10 of the recess so that the marginal portions of the valves will be seated firmly but will be free to move upwardly from the ridge or bead 8. This is accomplished by providing a ring follower 13 that is pressed against the valves 9 and 11 by a. relatively heavy coil spring 14, the upper end of which engages the base 15 of a recess 16 in the cylinder head 4.

In use the gas in the cylinder 1 will be forced upwardly by a suitable piston (not shown) through the openings 3 in the plate 2 and after unseating the marginal portions of the valves will flow upwardly through the recess 16 and out through the passage 5 in the cylinder head. Some of the compressed gas will be trapped between the wafers 9 and 11 so that when the coil spring 14; tends to seat the valves there will be acushioning effect not only between the seat 10 and the lower wafer 11 but also between'the upper and lower wafers.

From the foregoing it will be apparent that I have provided an improved pump valve assembly which aside from eliminating objectionable features found in pump valves now in use, is also simple in construction and can be manufactured at a comparatively low cost.

While it is believed that from the foregoing description the nature and advantage of my invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and described and that such changes may be resorted to when desired as fall within the scope of what is claimed.

hat I claim as my invention is:

1. A valve assembly comprising a plate having a recess therein provided with openings in the base thereof, a ridge between said openings and the adjacent walls of said recess, and means for controlling the flow of fluid through said openings including a pair of superposed wafer valves, the upper valve having its marginal port-ions normally seated upon said ridge and the lower valve having its marginal portions normally resting against the base of said ridge and closing said openings.

2. A valve assembly comprising a plate having a. recess therein provided with openings in the base thereof, a ridge between said openings and the adjacent walls of said recess, and means for controlling the flow of fluid through said openings including a pair of superposed wafer valves, the upper valve being of a greater diameter than the lower valve and having its marginal portions normally seating upon said ridge and the lower valve having its marginal portions curved downwardly and normally resting against the base of said ridge and closing said openlngs.

3. A valve assembly comprising a head, and a plate having an annular recess therein and provided with a plurality of passages for the flow of compressed refrigerant said passages being arranged in a circle in the base of said recess, means for controlling the.

flow of refrigerant through the said passages to the head including a pair of superposedwafer valves having marginal portions normally covering said passages and means comprising a spring for yieldably holding said valves upon the base of said recess.

4. A valve assembly comprising a head, and a plate having a plurality of passages for the flow of compressed refrigerant, and means for controllin the flow of refrigerant therethrough to the head including a pair of superposed wafer valves normally covering said passages and having their marginal edges spaced a slight distance apart whereby the refrigerant will be permitted to enter between said valves for obtaining a cushioning effect.

5. In a valve assembly, a head, a plate in superposed relation to said head and having a passage'therethrough for the flow of fluid, and means for controlling the flow of fluid through said passage to the head including a pair of superposed members cooperating directly with the plate and adapted to provide a double cushioning effect upon seating of said members.

6. In a valve assembly, a head, a plate in superposed relation to said head and having a passage therethrough for the flow of fluid, and means for controlling the flow of fluid through said passage to the head includin a pair of superposed wafer valves engagea le directly wlth said plate and normally cover.- ing said passage and adapted to provide a double cushioning efi'ect upon seating of said valves.

7. In a valve assembly, a head, a plate in superposed relation to said head and having a passage therethrough for the flow offluid, and means for controlling the flow of fluid through said passage to the head including a pair of superposed wafer valves havin marginal portions cooperating directly wit said plate and normally covering said assage and adapted to provide a double cus ioning effect upon seating of said valves. 7

8. In a valve assembly, a head, a plate in superposed relation to said head and havinga passage therethroughfor the flow of fluid, and means for controlling the flow of fluid through said passage to the head including a pair of superposed wafer valves cooperating directly with said plate and normally covering said passage, and yieldable means for normally holding said wafer valves against said plate.

9. In a valve assembly, a head, a plate in superposed relation to said head and having a plurality of passages therethrough for the flow of fluid, and means for controlling the flow of fluid through said passages to the head including a pair of superposed circular wafer valves havlng marginal portions cooperating directly with said plate and normally covering said passages.

10. In a valve assembly, a head, a plate in superposed relation to said head and having a plurality of circumferentially arranged passages for the flow of fluid, and means for controlling the flow of fluid through said passages to the head including a pair of superposed circular wafer valves, the lowermost valve being of a smallerdia'meter than the upper valve and havin its mar inal edges curved downwardly an%l normal y covering said passages.

11. In a valve assembly, a head, a plate in superposed relation to said head and having a passage therethrough for the flow of fluid, and means for controlling the flow of fluid through said passage to the head includin a pair of superposed valves cooperating directly with said plate and arranged so that a cushioning effect may be obtained upon the seatin of elther of the said valves.

12. In a valve assembly, a head, a plate in superposed relation to said head and havin a passage therethrough for the flow of flui and means for controlling the flow of fluid through said passage to the head, including a pair of SllPGIIJOSGd valves cooperating directly with sai plate and arranged so that a cushioning efiect may be obtained between the said valves upon the seating of the lower valve.

13. In a valve assembly, ahead, 0. late in superposed relation to said head and aving a passage therethrough for the flow of fillld, and means for controlling the flow of fluid through said passage to the head, including a air of superposed valves constructed and arranged so that a cushioning eflect may be obtained between the said valves upon the seating of the upper valve upon the 

